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Finding the Fourth Proportional to 763.92, 1,054.20 and 449.16

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Solution

The fourth proportional to 763.92, 1,054.20 and 449.16 is: 619.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.92 : 1,054.20 = 449.16 : x
  2. Step 2: Convert to fraction form
    763.92/1,054.20 = 449.16/x
  3. Step 3: Cross multiply
    763.92x = 1,054.20 × 449.16
  4. Step 4: Simplify right side
    763.92x = 473,504.47
  5. Step 5: Solve for x
    x = 473,504.47/763.92
  6. Step 6: Final answer
    x = 619.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.